Hard to tell. I had 3 silkie pullets who looked like that at that chick's age so I would suggest you just wait a few more weeks. Note that you have an unbearded silkie there so it will develop noticeable wattles regardless of gender.
Just for comparison, here are some pictures of my silkies when they were chicks:
4 week old pullet
4 week old pullet
5 week old pullets
5 week old pullets
5.5 week old pullet
7.5 weeks old - One of these is a cockerel, the other a pullet! Can you guess which?
7.5 weeks old - pullets!
The point is that it is very easy to get it wrong with silkies. When my chicks were growing up I swore I had 4 cockerels. Ended up with 3 pullets and one cockerel - perfect!